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A train moves through the Finger Lakes region of upstate New York.

The place that helped inspire American democracy

A total of 90 elk teeth were placed next to the hips and thighs of the body in grave 127, possibly attached to a garment resembling an apron. There were elk teeth pendants also on the waist. Red ochre had been sprinkled on top of the deceased.

Burial ground reveals Stone Age people wore clothing covered in elk teeth

Miles of unused pipe, prepared for the proposed Keystone XL pipeline, sit in a lot on October 14, 2014 outside Gascoyne, North Dakota. (Photo by Andrew Burton/Getty Images)

From Keystone XL to Paris Agreement, Joe Biden signals a shift away from fossil fuels

Life on the streets of Central Havana

Cuba Fast Facts

Greenland's ice sheet is the single biggest contributor to global sea level rise and recent studies show it's melting faster than expected. Here, on the ice sheet's southwestern side (pictured in summer 2017), water generated by melting ice carves rivers into the surface.

A 'frozen rainforest' of microscopic life is melting Greenland's ice sheet

For one year, this man is eating only what's grown at Dubai's Sustainable City

Green living in Dubai's Sustainable City

US President Joe Biden delivers his Inauguration speech after being sworn in as the 46th US President on January 20, 2021, at the US Capitol in Washington, DC. (Photo by Patrick Semansky / POOL / AFP) (Photo by PATRICK SEMANSKY/POOL/AFP via Getty Images)

Paris climate accord: Biden announces US will rejoin landmark agreement

Chicago, UNITED STATES: A passenger waits in line with her passport 23 January, 2007 before her Mexicana Air flight out of Chicago O'Hare International airport in Chicago, Illinois. As of 23 January, all Americans, Mexicans, Canadians and Bermudians traveling by air to the United States must for the first time carry a passport, said the Department of Homeland Security. The new measure is part of the department's Western Hemisphere Travel Initiative, following the recommendations of the National Commission on Terrorist Attacks on the United States, better known as the 9/11 Commission. It is aimed at making it more difficult for terrorists to enter the country with fake documents. AFP PHOTO/JEFF HAYNES (Photo credit should read JEFF HAYNES/AFP via Getty Images)

Find out which countries are welcoming US tourists back